What version are You using? I just checked on RHOSP-16 which is based on stable/train and the result is:

(overcloud) [stack@undercloud-0 ~]$ neutron agent-list --sort-column agent_type
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
+--------------------------------------+--------------------+---------------------------+-------------------+-------+----------------+---------------------------+
| id                                   | agent_type         | host                      | availability_zone | alive | admin_state_up | binary                    |
+--------------------------------------+--------------------+---------------------------+-------------------+-------+----------------+---------------------------+
| 643a494d-ad06-4455-9c6b-6ad35f7b2f5e | DHCP agent         | controller-2.redhat.local | nova              | :-)   | True           | neutron-dhcp-agent        |
| 8a092f5b-f415-4473-ac8e-9ca333b037bc | DHCP agent         | controller-0.redhat.local | nova              | :-)   | True           | neutron-dhcp-agent        |
| 8a384ede-4ccb-4321-b170-2448344b92fd | DHCP agent         | controller-1.redhat.local | nova              | :-)   | True           | neutron-dhcp-agent        |
| 2ec9c0d6-57d8-4803-9b44-942542e53d6e | L3 agent           | controller-0.redhat.local | nova              | :-)   | True           | neutron-l3-agent          |
| 758c19ef-0bb3-48bb-a757-90956b830914 | L3 agent           | controller-1.redhat.local | nova              | :-)   | True           | neutron-l3-agent          |
| 9cec9036-0d0f-432a-a0ea-4420f1e88921 | L3 agent           | controller-2.redhat.local | nova              | :-)   | True           | neutron-l3-agent          |
| b0d7fb33-607a-4903-9bf3-987743f237a7 | L3 agent           | compute-1.redhat.local    | nova              | :-)   | True           | neutron-l3-agent          |
| bf84115b-fc33-41c6-8734-2cbe1c9a7a5c | L3 agent           | compute-0.redhat.local    | nova              | :-)   | True           | neutron-l3-agent          |
| 386111f1-563c-4a2c-9b41-b292a1aa876e | Metadata agent     | compute-0.redhat.local    |                   | :-)   | True           | neutron-metadata-agent    |
| 43d33cd1-c817-4755-8628-e759402acc5b | Metadata agent     | controller-0.redhat.local |                   | :-)   | True           | neutron-metadata-agent    |
| ad765ce7-f2e2-4db3-8ff7-1765e5e5bb93 | Metadata agent     | controller-2.redhat.local |                   | :-)   | True           | neutron-metadata-agent    |
| c832081f-d598-483c-bb57-4f616e631fbb | Metadata agent     | controller-1.redhat.local |                   | :-)   | True           | neutron-metadata-agent    |
| dbd82bdb-43d3-46de-99bc-a8364f260457 | Metadata agent     | compute-1.redhat.local    |                   | :-)   | True           | neutron-metadata-agent    |
| 274076b0-56b1-407a-9903-2a6529d6be77 | Open vSwitch agent | compute-1.redhat.local    |                   | :-)   | True           | neutron-openvswitch-agent |
| 98ed6974-b379-4eb6-8267-d76cd38f9379 | Open vSwitch agent | controller-0.redhat.local |                   | :-)   | True           | neutron-openvswitch-agent |
| d56166f9-edd1-49a7-865a-2de2a25fe47e | Open vSwitch agent | controller-1.redhat.local |                   | :-)   | True           | neutron-openvswitch-agent |
| ea6d2831-10a1-4df4-8914-d46d8f81572d | Open vSwitch agent | compute-0.redhat.local    |                   | :-)   | True           | neutron-openvswitch-agent |
| eb7e8b70-279d-43f1-a863-fed7953b29ac | Open vSwitch agent | controller-2.redhat.local |                   | :-)   | True           | neutron-openvswitch-agent |
+--------------------------------------+--------------------+---------------------------+-------------------+-------+----------------+---------------------------+
(overcloud) [stack@undercloud-0 ~]$ neutron agent-list --sort-column host
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
+--------------------------------------+--------------------+---------------------------+-------------------+-------+----------------+---------------------------+
| id                                   | agent_type         | host                      | availability_zone | alive | admin_state_up | binary                    |
+--------------------------------------+--------------------+---------------------------+-------------------+-------+----------------+---------------------------+
| 386111f1-563c-4a2c-9b41-b292a1aa876e | Metadata agent     | compute-0.redhat.local    |                   | :-)   | True           | neutron-metadata-agent    |
| bf84115b-fc33-41c6-8734-2cbe1c9a7a5c | L3 agent           | compute-0.redhat.local    | nova              | :-)   | True           | neutron-l3-agent          |
| ea6d2831-10a1-4df4-8914-d46d8f81572d | Open vSwitch agent | compute-0.redhat.local    |                   | :-)   | True           | neutron-openvswitch-agent |
| 274076b0-56b1-407a-9903-2a6529d6be77 | Open vSwitch agent | compute-1.redhat.local    |                   | :-)   | True           | neutron-openvswitch-agent |
| b0d7fb33-607a-4903-9bf3-987743f237a7 | L3 agent           | compute-1.redhat.local    | nova              | :-)   | True           | neutron-l3-agent          |
| dbd82bdb-43d3-46de-99bc-a8364f260457 | Metadata agent     | compute-1.redhat.local    |                   | :-)   | True           | neutron-metadata-agent    |
| 2ec9c0d6-57d8-4803-9b44-942542e53d6e | L3 agent           | controller-0.redhat.local | nova              | :-)   | True           | neutron-l3-agent          |
| 43d33cd1-c817-4755-8628-e759402acc5b | Metadata agent     | controller-0.redhat.local |                   | :-)   | True           | neutron-metadata-agent    |
| 8a092f5b-f415-4473-ac8e-9ca333b037bc | DHCP agent         | controller-0.redhat.local | nova              | :-)   | True           | neutron-dhcp-agent        |
| 98ed6974-b379-4eb6-8267-d76cd38f9379 | Open vSwitch agent | controller-0.redhat.local |                   | :-)   | True           | neutron-openvswitch-agent |
| 758c19ef-0bb3-48bb-a757-90956b830914 | L3 agent           | controller-1.redhat.local | nova              | :-)   | True           | neutron-l3-agent          |
| 8a384ede-4ccb-4321-b170-2448344b92fd | DHCP agent         | controller-1.redhat.local | nova              | :-)   | True           | neutron-dhcp-agent        |
| c832081f-d598-483c-bb57-4f616e631fbb | Metadata agent     | controller-1.redhat.local |                   | :-)   | True           | neutron-metadata-agent    |
| d56166f9-edd1-49a7-865a-2de2a25fe47e | Open vSwitch agent | controller-1.redhat.local |                   | :-)   | True           | neutron-openvswitch-agent |
| 643a494d-ad06-4455-9c6b-6ad35f7b2f5e | DHCP agent         | controller-2.redhat.local | nova              | :-)   | True           | neutron-dhcp-agent        |
| 9cec9036-0d0f-432a-a0ea-4420f1e88921 | L3 agent           | controller-2.redhat.local | nova              | :-)   | True           | neutron-l3-agent          |
| ad765ce7-f2e2-4db3-8ff7-1765e5e5bb93 | Metadata agent     | controller-2.redhat.local |                   | :-)   | True           | neutron-metadata-agent    |
| eb7e8b70-279d-43f1-a863-fed7953b29ac | Open vSwitch agent | controller-2.redhat.local |                   | :-)   | True           | neutron-openvswitch-agent |
+--------------------------------------+--------------------+---------------------------+-------------------+-------+----------------+---------------------------+

So You can sort the results based on various columns